報告題目：Utilizing metal nanostructures for optical and electrical gains in organic optoelectronic devices
報 告 人：Assoc. Prof. Jung-Yong Lee
Korea Advanced Institute of Science and Technology (KAIST), Korea
報告時間：2015年11月24日下午2:50-3:40
報告地點：化學樓二樓一號會議室
報告人簡介：
Ph. D, Stanford University, USA
M. S. Seoul National University, Korea
B. S. Seoul National University, Korea
報告簡介：
Here, we investigate the dependence of metal nanoparticles’ size and shape, at various concentrations, on the power conversion efficiency of organic solar cells (OSCs)[1]. Also, we propose a metal-metal core-shell nanocube (NC) as an advanced plasmonic material for highly efficient OSCs. We covered an Au core with a thin Ag shell as a scattering enhancer to build Au@Ag NCs, showing stronger scattering efficiency than pristine Au nanoparticles (AuNPs) throughout the visible range. Highly efficient plasmonic organic solar cells were fabricated by embedding Au@Ag NCs into an anodic buffer layer, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)[2, 3].
In the second part, we demonstrate that the metal nanoparticles can improve the performance of OSCs by boosting the internal quantum efficiency (IQE) of the devices even without a notable plasmonic optical gain.[4] A hybrid layer platform in combination of silver nanoparticles (AgNPs) and polyethylenimine-ethoxylated (PEIE) layer maximized the IQE of the OSCs to nearly 100 %. 2D surface characterization confirmed the AgNPs provided the short path and funneled charge carriers to a cathode, which would effectively raise the carrier mobility. Moreover, the hybrid layer doubled the device half-efficiency lifetime due to longer retention of the improved mobility.
